メタデータ
| 項目 |
値 |
| Designation |
C/2021 T1 (Lemmon) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2021-10-14T01:40:49.874880Z |
| Orbit solution date (soln_date, UTC) |
2022-07-31T01:43:17Z |
| Obs used |
114 |
| NEO |
- |
| M1 |
11.500 |
| K1 |
13.250 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2021-10-02T04:59:50.640000Z |
| Discovery magnitude (MPC) |
20.04 G |
| Discovery observatory (MPC) |
G96 · Mt. Lemmon Survey |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2021-12-07.0000000 |
| e |
0.99796291 |
| q (au) |
3.058012 |
| a (au) |
1501.163873 |
| i (deg) |
140.350038 |
| Ω (om, deg) |
56.816270 |
| ω (w, deg) |
51.501528 |
| M (ma, deg) |
0.000914 |
等級
散乱 + 全体線形
$$
M_a = (10.107 + 5.998\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
10.107 |
| n |
5.998 |
| gf |
0.999 |
| gb |
-1.000 |
| k |
0.999 |
| δ90 |
9.999 |
| パラメータ |
記号 |
範囲 |
説明 |
| 太陽・地球距離が1 AUのときの絶対等級 |
H0 |
-5 to 20 |
彗星の固有の明るさ |
| 測光スロープパラメータ |
n |
2 to 6 |
太陽距離に対する明るさ変化率 |
| 前方散乱非対称係数 |
gf |
0.8 to 1 |
前方散乱の強さ |
| 後方散乱非対称係数 |
gb |
-1 to -0.5 |
後方散乱の強さ |
| 分配係数 |
k |
0.8 to 1 |
前方/後方散乱の寄与比 |
| ダスト/ガス明るさ比 |
δ90 |
1 to 10 |
ダスト散乱とガス放射の相対寄与 |
参考: EPSC-DPS2025-160
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
16:05:01.10 |
-16:29:29.5 |
HIP 78664 |
21.65 |
| 2026-05-12 12:00 |
16:04:49.70 |
-16:29:13.4 |
HIP 78664 |
18.94 |
| 2026-05-13 00:00 |
16:04:38.29 |
-16:28:57.2 |
HIP 78664 |
16.24 |
| 2026-05-13 12:00 |
16:04:26.86 |
-16:28:41.1 |
HIP 78664 |
13.55 |
| 2026-05-14 00:00 |
16:04:15.42 |
-16:28:24.9 |
HIP 78664 |
10.90 |
| 2026-05-14 12:00 |
16:04:03.97 |
-16:28:08.8 |
HIP 78664 |
8.31 |
| 2026-05-15 00:00 |
16:03:52.51 |
-16:27:52.7 |
HIP 78664 |
5.88 |
| 2026-05-15 12:00 |
16:03:41.03 |
-16:27:36.6 |
HIP 78664 |
3.91 |
| 2026-05-16 00:00 |
16:03:29.55 |
-16:27:20.6 |
HIP 78664 |
3.36 |
| 2026-05-16 12:00 |
16:03:18.06 |
-16:27:04.5 |
HIP 78664 |
4.76 |
| 2026-05-17 00:00 |
16:03:06.56 |
-16:26:48.5 |
HIP 78664 |
7.02 |
| 2026-05-17 12:00 |
16:02:55.06 |
-16:26:32.5 |
HIP 78664 |
9.56 |
| 2026-05-18 00:00 |
16:02:43.55 |
-16:26:16.6 |
HIP 78664 |
12.20 |
| 2026-05-18 12:00 |
16:02:32.04 |
-16:26:00.7 |
HIP 78664 |
14.89 |
| 2026-05-19 00:00 |
16:02:20.52 |
-16:25:44.8 |
HIP 78664 |
17.61 |
| 2026-05-19 12:00 |
16:02:09.00 |
-16:25:28.9 |
HIP 78664 |
20.34 |
| 2026-05-20 00:00 |
16:01:57.48 |
-16:25:13.1 |
HIP 78664 |
23.08 |
| 2026-05-20 12:00 |
16:01:45.96 |
-16:24:57.4 |
HIP 78400 |
21.76 |
| 2026-05-21 00:00 |
16:01:34.44 |
-16:24:41.6 |
HIP 78400 |
19.27 |
| 2026-05-21 12:00 |
16:01:22.92 |
-16:24:26.0 |
HIP 78400 |
16.85 |
| 2026-05-22 00:00 |
16:01:11.40 |
-16:24:10.4 |
HIP 78400 |
14.57 |
| 2026-05-22 12:00 |
16:00:59.89 |
-16:23:54.8 |
HIP 78400 |
12.49 |
| 2026-05-23 00:00 |
16:00:48.38 |
-16:23:39.3 |
HIP 78400 |
10.73 |
| 2026-05-23 12:00 |
16:00:36.88 |
-16:23:23.8 |
HIP 78400 |
9.46 |
| 2026-05-24 00:00 |
16:00:25.38 |
-16:23:08.4 |
HIP 78400 |
8.90 |
| 2026-05-24 12:00 |
16:00:13.89 |
-16:22:53.1 |
HIP 78400 |
9.17 |
| 2026-05-25 00:00 |
16:00:02.41 |
-16:22:37.8 |
HIP 78400 |
10.22 |
| 2026-05-25 12:00 |
15:59:50.94 |
-16:22:22.6 |
HIP 78400 |
11.83 |
| 2026-05-26 00:00 |
15:59:39.47 |
-16:22:07.5 |
HIP 78295 |
10.77 |
| 2026-05-26 12:00 |
15:59:28.02 |
-16:21:52.4 |
HIP 78295 |
9.23 |
| 2026-05-27 00:00 |
15:59:16.58 |
-16:21:37.4 |
HIP 78295 |
8.35 |
| 2026-05-27 12:00 |
15:59:05.15 |
-16:21:22.5 |
HIP 78295 |
8.33 |
| 2026-05-28 00:00 |
15:58:53.73 |
-16:21:07.6 |
HIP 78295 |
9.17 |
| 2026-05-28 12:00 |
15:58:42.33 |
-16:20:52.9 |
HIP 78295 |
10.68 |
| 2026-05-29 00:00 |
15:58:30.95 |
-16:20:38.2 |
HIP 78295 |
12.61 |
| 2026-05-29 12:00 |
15:58:19.58 |
-16:20:23.6 |
HIP 78295 |
14.80 |
| 2026-05-30 00:00 |
15:58:08.22 |
-16:20:09.1 |
HIP 78295 |
17.14 |
| 2026-05-30 12:00 |
15:57:56.89 |
-16:19:54.6 |
HIP 78295 |
19.58 |
| 2026-05-31 00:00 |
15:57:45.57 |
-16:19:40.3 |
HIP 78120 |
20.10 |
| 2026-05-31 12:00 |
15:57:34.27 |
-16:19:26.0 |
HIP 78120 |
18.72 |
| 2026-06-01 00:00 |
15:57:22.99 |
-16:19:11.8 |
HIP 78120 |
17.66 |
| 2026-06-01 12:00 |
15:57:11.73 |
-16:18:57.8 |
HIP 78120 |
16.98 |
| 2026-06-02 00:00 |
15:57:00.49 |
-16:18:43.8 |
HIP 78120 |
16.71 |